Blueseventy Reaction Full Wetsuit - Men's Lowered collar: Reduced rear collar height prevents chafing #38 Yamamoto Neoprene Buoyancy: 4-5-4 Knee Flex Panels: textured panels assist w/ flexibility and reduced bunching Sleeves feature A-Flex Orange stretch: 4 way movement and 1.55 mm arms w/ oversized underarm gussets